在300℃、8~8.2MPa的模拟压水环境对UN/U3Si2(30wt%)复合芯块考核1h,利用金相显微镜观察芯块腐蚀后的宏观形貌。经考核1h后,芯块表面较为完整,没有明显的腐蚀坑,在部分区域,出现微裂纹,这些裂纹逐渐向芯块内部扩展。
The UN/U3Si2(30wt%) composite pellets was first corroded at 300℃ under 8~8.2MPa for 1h, and then, the macroscopic morphology of UN/U3Si2(10wt%) composite pellets after corrosion was observed by metallographic microscopy. After corrosion for 1h, the surface of UN/U3Si2(10wt%) composite pellets seems to be relatively intact, without obvious corrosion pits. Moreover, for the UN/U3Si2(10wt%) composite pellet after corrosion for 1h, some micro-cracks are exist at some areas, and these cracks gradually expand to the interior of these pellets.